Wow, not a single response to my suggested method. If there is interested I can pick up Ep IV and post some proof of concept snaps. (I do not currently have the disc.)

Also... in the past I have used that method with stills (like the Technocolor screenshots) in VDub using Color Tools, so I actually have a hard comparison for the vectorscope and waveform monitor.

It works really well because then you aren't just trying to eyeball things, you have actual peeks and levels you are comparing.